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I want to search file for pattern, duplicate every line that matches that pattern, then in perform substitution on each duplicated line.
Suppose file looks like this:
a 1
a 2
b 1
b 2
c 1
c 2
I want to duplicate each line matching /2, then substitute 2 with 3 (s/2/3), and end up with file:
a 1
a 2
a 3
b 1
b 2
b 3
c 1
c 2
c 3
You can do that with a :g command which marks all lines on which to act and then run a combination of a :t (copy) and :s (substitute) command.
Something like this should work:
g/2$/t.|s/2/3
This executes on each line matching 2$ the following command: :t.|s/2/3
which means, copy the current line and afterwards replace the 2 by 3 in the current (copied) line.
